can anybody help me up with network proxy configuration of debian 4.0.

What about network proxy configuration?

i have done it through system network configuration. in advance configuration i am unable to add list of host to be ignored. please help.

actualy till yesterday my intenet was running. i was browsing with epipheny web browser. today it give the message "could not connect to proxy server. check your proxy server setting if the connection still fails there may be a problem with your proxy server or your network connection." i remind you that i have not change proxy and the connection is doing well with other system. please help.

I think you need to be more specific of what really is that you're having problems with.

actualy i am using debian 4.0. i am brousing internet through epipheny web browser. i was availing internet uptill 2 dyas ago. but suddenly one fine morning i am not getting internet and the message showing in epipheny is "could not connect to proxy server. check your proxy server setting if the connection still fails there may be a problem with your proxy server or your network connection." the net connection is running well with other machine where i am using fedora core distribution. i have not changed any proxy connection in between. so not understading what could be the problem. please help.

Are you able to ping your proxy server?